Its basicaly used to exercise the addresss bus on the board...(The cpu constantly runs the nop instruction which is hard wired - so it 'counts' through all memory locations).. By using a signature analyser on various lines on the board, is is possible to produce useful fault finding information.... For instance... if say A15 was faulty down stream from the cpu (maybe due to a driver IC or a short) - it would produce a differnt signature than a working board.... you could also test eproms and such to an extent... Hope this helps.... I'm sure someone can provide a much better explanation.... Cheers, Colin ----- Original Message ----- From: "kevin spears" <micrologix1500@yahoo.com> To: <techtoolslist@flippers.com> Sent: Thursday, February 05, 2009 8:16 PM Subject: [Techtoolslist] Atari 6502A NOP adapter
This is surely a dumb question, but what is the purpose of the NOP adapter?
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